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Related Concept Videos

Bone Disorders01:29

Bone Disorders

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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
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Pharmacodynamics in Geriatric Patients: Effects of Age01:27

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Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
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Changes in the Appendicular Skeleton with Age01:09

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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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The Effect of Aging on Tissues01:19

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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism01:18

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Geriatric patients show significant variation in how their bodies process medications, which can change how effective and safe treatments are. The liver is the primary organ where drug metabolism occurs, involving two main types of chemical reactions: phase I and II. Phase I metabolism is driven by the cytochrome P450 enzyme system, which includes key types such as CYP3A, CYP2D6, and CYP2C9. Research indicates that while aging doesn't notably alter the levels or activity of these enzymes, it...
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Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

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The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
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Related Experiment Video

Updated: Mar 31, 2026

Author Spotlight: Assessing Surgical Frailty with Point-of-Care Ultrasound of Quadriceps Muscles
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Overlaps between Frailty and Sarcopenia Definitions.

Tommy Cederholm

    Nestle Nutrition Institute Workshop Series
    |October 21, 2015
    PubMed
    Summary

    Aging causes muscle loss (sarcopenia) and frailty, impacting mobility and leading to disability. Early screening and interventions like exercise and nutrition can help manage these geriatric conditions.

    Area of Science:

    • Gerontology
    • Muscle Physiology
    • Geriatric Medicine

    Background:

    • Aging is associated with muscle catabolism, leading to sarcopenia and frailty, which are geriatric syndromes with overlapping phenotypes.
    • Primary sarcopenia, an age-related loss of muscle mass and function, often precedes frailty, progressing towards disability and mortality.
    • Frailty encompasses exhaustion, weakness, and slowness, while sarcopenia specifically focuses on muscle mass and function, with both conditions influenced by age, disease, and lifestyle.

    Purpose of the Study:

    • To differentiate between sarcopenia and frailty, highlighting their overlapping yet distinct characteristics.
    • To discuss diagnostic measures and screening strategies for sarcopenia and frailty in older adults.
    • To outline overlapping treatment approaches for both conditions.

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    Main Methods:

    • Comparative analysis of sarcopenia and frailty definitions, phenotypes, and diagnostic criteria.
    • Review of suggested diagnostic measures including gait speed, hand grip strength, and body composition.
    • Discussion of screening protocols for frailty and sarcopenia in different age groups.

    Main Results:

    • Frailty requires weight loss, whereas sarcopenia requires muscle loss, though both share criteria like reduced muscle function.
    • Gait speed and hand grip strength are proposed as key diagnostic indicators for both conditions.
    • Screening for frailty involves assessing walking capacity, fatigue, and activity levels, while sarcopenia screening in younger adults (<70) includes gait speed/grip strength and body composition.

    Conclusions:

    • Frailty screening should be integrated into geriatric assessments, starting with walking capacity and fatigue assessment.
    • Sarcopenia screening in younger adults can utilize gait speed or grip strength followed by body composition analysis.
    • Effective treatments for both frailty and sarcopenia involve adequate protein and vitamin D supplementation, alongside resistance exercise programs.